JP2000007273A - Safety alarming device for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety alarm for a working machine capable of transmitting sufficient information for proper operation to an unexperienced operator and transmitting required minimum information to an experienced operator. SOLUTION: A safety alarming device for a working machine equipped with a telescopic boom on a vehicle in a freely derricking manner comprises a boom condition detecting means 11 for detecting the condition of the telescopic boom, a safety gear 12 for receiving signals from the boom condition detecting means 11 and judging that the condition of the telescopic boom gets to a critical area closer to a safety limit as predetermined or to the safety limit to output a signal 12a and a voice alarm 17 for receiving the signal 12a and issuing a voice alarm, the voice alarm 17 preparing at least a simplified message 18a and a detailed message 18b as the contents of the voice alarm, the contents of the voice alarm being selectable with a selecting means 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety alarm device for a working machine.

[0002]

2. Description of the Related Art A conventional work machine of this type is an aerial work vehicle A shown in FIG. This aerial work vehicle A is provided with a swivel 2 on a vehicle 1 so as to be freely rotatable, and a swivel drive (not shown) disposed between the vehicle 1 and the swivel 2. Can be driven to rotate.

[0003] The swivel 2 is provided with a telescopic boom 3 that can be raised and lowered. The telescopic boom 3 is composed of an intermediate boom 5 and a leading boom 6 which are sequentially inserted into the base boom 4 so as to be able to telescopically extend, and a telescopic driving device (not shown, for example, a telescopic cylinder, a simultaneous telescopic wire rope, etc.) ) Are arranged, and the intermediate boom 5 is moved from the base boom 4 to the intermediate boom 5.
The boom 6 can be driven to extend and retract. Basic boom 4
Has a base end portion pivotally supported by the swivel base 2 and an up-and-down driving device (up-down cylinder 7) is arranged between the swivel base 2 and the base boom 4 at an appropriate position so that the up-and-down drive can be performed.

[0004] At the tip of the boom 6, a driving device for swinging the worktable 8 (a turning drive device capable of turning the worktable 8 at the tip of the boom 6) is disposed. On the other hand, the worktable 8 can be swung. An operation device 9 is disposed on the worktable 8, and the operation device 9 is turned correspondingly to drive each of the actuators of the turning drive device, the telescopic drive device, the up / down drive device, and the swing drive device. The control lever includes an operation lever, a telescopic operation lever, an up / down operation lever, and a swing operation lever. Each operation lever is instructed to drive and stop the actuator by forward / reverse tilting and neutral return of the operation lever.

When working with the aerial work vehicle A, depending on the boom state of the telescopic boom 3, the telescopic boom 3 can be extended or retracted into the cab 10 of the vehicle 1 or a tool box (not shown) arranged on the vehicle 1. The following safety alarm device B is provided to prevent the boom 3 from interfering. That is, as shown in FIG. 6, a boom state detecting means 11 for detecting a state of the telescopic boom 3 and a state of the telescopic boom 3 receiving a signal from the boom state detecting means 11 are set to a safety limit (here, the cab 10). Alternatively, although not shown, the safety device 12 generates a signal 12a when reaching a limit position where the telescopic boom 3 interferes with a tool box or the like disposed on the vehicle 1).
And an audio alarm device 13 that operates in response to a signal from the safety device 12.

The boom state detecting means 11 includes a length detector 11a for detecting the boom length of the telescopic boom 3, an undulation angle detector 11b for detecting the undulation angle of the telescopic boom 2, and a turning angle of the telescopic boom 3. Is provided.

[0007] The safety device 12 is provided with each of the detectors 11a.
Boom state calculating means 14 for calculating the boom state of the telescopic boom 3 in response to signals from 〜11c; safety limit storage means 15 for storing a safety limit immediately before the telescopic boom 3 reaches the limit position; In response to the signals from the calculating means 14 and the safety limit storage means 15, it is determined whether the boom state of the telescopic boom 3 has reached the safety limit stored in the safety limit storage means 15, and if it has, the signal 1 is output.
A safety limit discriminating means 16 for generating 2a is provided.

The voice alarm device 13 includes a message storage means 13a for storing a message (for example, a message saying "It is a safety limit. Conversely, please operate or move away from the safety limit"). It is composed of a voice generator 13b that outputs a message by voice,
When the signal 12a is received from the safety device 12, the stored message is output by the voice generator 13b.

The safety alarm device B configured as described above is
When the telescopic boom 3 reaches the safety limit, the safety device 12
Upon receiving a signal from the boom state detecting means 11, it is determined that the telescopic boom 3 has reached the safety limit, a signal 12a is generated, and the voice alarm device 13 is operated to notify the operator.

[Problems to be solved by the invention]

However, in recent years, the amount of information to be conveyed increases with the advancement of functions of work machines, and the message tends to be longer. For an inexperienced operator, presentation of information by voice alarm is important because required information can be easily obtained. On the other hand, when the operator becomes accustomed to the working machine, the information grasp of the working machine becomes accurate, and when the working machine is warned by the safety device, appropriate measures such as an avoidance operation can be performed without a detailed message. Providing frequent, detailed messages in these situations is
This can be harsh and uncomfortable for the operator. SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a safety alarm device for a working machine that transmits sufficient information to an unskilled operator to perform an appropriate operation, and transmits a minimum necessary amount of information to a skilled operator. The purpose is to provide.

[0011]

To achieve the above object, a safety alarm device for a working machine according to claim 1 of the present invention comprises:
A working machine equipped with a telescopic boom that can be raised and lowered on the vehicle, a boom state detecting means for detecting a state of the telescopic boom,
A safety device that receives a signal from the boom state detection means, determines that the state of the telescopic boom has reached a danger zone or a safety limit that has approached a safety limit by a predetermined amount or more, and outputs a signal, and a signal from the safety device. In the safety alarm device of a working machine equipped with a voice alarm device for receiving a voice by receiving the voice alarm, the voice alarm device prepares at least a simple message and a detailed message as the content of the voice alarm, and the voice alarm is provided by the selection means. Is configured to be selectable.

According to a second aspect of the present invention, there is provided a safety alarm device for a working machine according to the present invention, wherein the selecting means of the first aspect is configured so that the content of an audio alarm can be selected by a switch.

According to a third aspect of the present invention, there is provided a safety alarm device for a working machine according to the present invention, wherein the content of an audio alarm can be selected by the number of signals received from the safety device by the selection means of the first aspect. Is what you do.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the same reference numerals 1 to 12, 14 to 16, 11a to 11c, 12a, 13b, and A described in the related art are used in the following description, and the same reference numerals are used. Detailed description is omitted.

In FIG. 1, C is a safety alarm device for a working machine according to the present invention. The safety alarm device C is different from the safety device described in the related art in the sound alarm device. That is, reference numeral 17 denotes a voice alarm device, which comprises a voice alarm generator 13b, a message storage unit 18, and a selection unit 19. The message storage unit 18 stores a simple message 18a and a detailed message 18b. The simple message 18a stores a simple message such as "Safety limit."It's the limit. Conversely, do the operation or move away from the safety limit. "

The selection means 19 includes a message storage means 18
Is selected to transmit either the simple message 18a or the detailed message 18b stored in the voice message generator 13b and the selected message is transmitted to the voice generator 13b. The selecting means 19 shown in FIG. 1 is constituted by a switch. (Hereinafter described as a switch).

The safety alarm device C configured as described above operates as follows. First, before the operation, the operator selects whether to output a simple message or a detailed message using the switch 19. It is assumed that the user selects the simple message. And while working, telescopic boom 3
When the state reaches the safety limit, the safety device 12 receives a signal from the boom state detection means 11, determines that the telescopic boom 3 has reached the safety limit, and generates a signal 12a. The voice alarm device 17 outputs the simple message (for example, "Safety limit") from the voice generator 13b because the simple message 18a is selected by the switch 19.
Let the operator know that it is a safety limit. At this time, if the detailed message 18b is selected by the switch 19, a detailed message (for example, "It is a safety limit. Conversely, please operate or move away from the safety limit.") Is output from the voice generator 13b.

That is, in the safety alarm device C, if the detailed message 18b is selected by the switch 19, sufficient information for performing an appropriate operation to an unskilled operator can be transmitted, and
Thus, if the simple message 18a is selected, the required minimum information can be transmitted to the skilled operator.

In the above-described embodiment, it has been described that the warning is output by a simple message or a detailed message by the switch 9 before the safety limit is reached. May select a simple message, output a simple message when the safety limit is reached, and then select a detailed message to output a detailed message. That is, a simple message may always be selected, and a detailed message may be selected when needed.

Next, in the above embodiment, the switch 19 is used as the selection means.
May be configured so that the content of the voice alert can be selected according to the number of times. That is, the safety alarm device D as shown in FIG. 2 is different from the safety alarm device C in that a number discriminator 21 is provided instead of the switch 19 as selection means. When the number of times discriminator 21 reaches the safety limit for the first time and receives signal 12a from safety device 12, it selects simple message 18a, causes voice generator 13b to output a simple message, and then once escapes from the safety limit and again. Detailed message 18b when safety limit is reached
Is selected, and a detailed message is output from the voice generator 13b. When the vehicle escapes from the safety limit and reaches the safety limit again, the detailed message 18b is selected.

Safety monitoring device D constructed and operated in this way
However, since a skilled operator does not often reach the safety limit, only a simple message is output. On the other hand, an inexperienced operator is often considered to reach the safety limit, and a detailed message is output to the inexperienced operator, so that sufficient information is transmitted to perform an appropriate operation.

Further, an embodiment of a safety alarm device for a working machine which has been developed is shown in FIG. 3 and will be described below. E is a safety alarm device, a first selection means 24 for deciding whether to select the simple message 18a or the detailed message 18b to the voice alarm device 23, and a detailed message 1
8b stored in a plurality of detailed messages 18b1 to 18b1.
A second selecting means 25 for selecting a desired detailed message from 18b3 is arranged. Therefore, the message storage means 26 stores the simple message 18a and the plurality of detailed messages 18b1 to 18b3, and the plurality of detailed messages 18b1 to 18b2 store the message of the cause of reaching the safety limit. For example, the detailed message 18b1 is "Safety limit. The boom has been extended to the safety limit." The detailed message 18b2 is "Safety limit. The boom has fallen and the safety limit." The detail message 18b3 is "The safety limit.
The boom swivel has reached the safety limit. Is remembered.

Reference numeral 27 denotes operation detection means of the operation device 9, which includes a boom extension operation detector 27a, a boom contraction operation detector 27a ', a boom downturn operation detector 27b, a boom raising operation detector 27b', and a clockwise rotation. A turn operation detector 27c and a left turn operation detector 27c 'are provided. Reference numeral 28 denotes a safety device, which is provided with an operation direction discriminating means 29 and a safety limit cause discriminating means 30 in addition to a conventional safety device. The operation direction determining unit 29 is a unit that receives a signal from the operation detecting unit 27 and determines the operating direction of the telescopic boom 3. The safety limit cause determination means 30 receives signals from the boom state calculation means 14, the safety limit storage means 15, and the operation direction determination means 29, determines the cause of the operation reaching the safety limit, and outputs a signal 30a indicating the cause. Is a means for outputting.

The second selecting means 25 receives the signal 30a and selects a detailed message corresponding to the cause from a plurality of detailed messages 18b to 18c.

The safety alarm device E constructed and operated as described above
When the simple message is selected by the first selecting means 24, the simple message is output when the safety limit is reached, so that the required minimum information can be transmitted to the skilled operator. On the other hand, when the detailed message is selected by the first selecting means 24, the second selecting means 2
5 receives the signal 30a from the safety limit cause determining means 30 and selects a detailed message corresponding to the cause from a plurality of detailed messages 18b to 18c.

For example, if the telescopic boom 3 is extended and the safety limit is reached, the signal 30a from the safety limit cause determining means 30 sends the detailed message 1 to the second selecting means 25.
8b is output. Therefore, sound generator 1
From 3b, a message saying "It is the safety limit. The boom has been extended and the safety limit has been reached." Is output.
Therefore, if a detailed message is selected by the first selecting means 24, it is possible to transmit sufficient information to an unskilled operator by performing an appropriate operation.

In the safety alarm device E, a plurality of detailed messages 18b1 to 18b3 are used to store a message indicating the cause of reaching the safety limit. However, the operation is further stored up to an operation to escape from the safety limit and an alarm is issued until a return operation. You may do so.

Next, the first selecting means 2 of the safety device E will be described.
FIG. 4 shows an embodiment of the safety alarm device F in which No. 4 is automatically selected, and will be described below. In FIG. 4, reference numeral 31 denotes a safety device. The safety device 28 described above has a function added to a safety limit cause determination unit 30 described later, and a dangerous operation number determination unit 32 is added.

Reference numeral 30 'denotes safety limit cause determining means, which is the safety limit cause determining means 3 described in the safety device E.
In addition to determining the cause of the operation that has reached the safety limit, which is the function of 0, and outputting a signal 30a that has determined the cause, it also receives signals from the boom state calculation unit 14, the safety limit storage unit 15, and the operation direction determination unit 29. In addition, a function of discriminating that the operation is on the dangerous side and outputting the signal 30b is added.

Numeral 32 is a dangerous operation number discriminating means.
It has a function of adding the number of times internally, and the signal 12a from the safety limit determination means 16 and the safety limit cause determination means 3
When the signal 30b from 0 'is received, the number is added, and when the signal 12a is not received, the number is cleared.

Reference numeral 23 'denotes a voice alarm device, which is the first selecting means 2 of the voice alarm device 23 shown and described in FIG.
This is the same as the voice alarm device 23 except that the number 4 is changed to the first selection means 24 '. Reference numeral 24 'denotes a first selecting means which can automatically select the first selecting means 24 shown in FIG. 3 by a signal 32a from the dangerous operation number discriminating means 32. When outputting a signal to the first selecting means 24 ', the dangerous operation number determining means 32 outputs a signal 32a for selecting the simple message 18a when the number of times is one, and the number of times is two or more. Sometimes a signal 32 that selects the detail message 18b
a is output.

The safety alarm device F thus configured is
It works as follows. That is, when the telescopic boom 3 reaches the safety limit, the signal 12a is output from the safety limit determining means 16. Also, since the operation has reached the safety limit and the operation has reached the safety limit, the safety limit cause determination means 3
0 ′ indicates that the operation is on the dangerous side and the signal 3
0b is output. Therefore, the dangerous operation number determining means 32
The number of times is set from 0 to 1, a signal 32a for selecting the simple message 18a is output to the first selecting means 24 ', and the simple message is output from the voice generator 13b.

After that, when the operation lever is returned to neutral and the actuator is stopped, the safety limit cause determining means 30 'does not output the signal 30b because the dangerous side operation is not performed. Therefore, the dangerous operation number determining means 32
Remains set to one. Next, when the operation of the operation lever is further attempted to exceed the safety limit (operation on the dangerous side), the safety limit cause determining means 30 'determines that the operation is on the dangerous side, and outputs a signal 30b. Is output. Since the safety limit has been reached and the signal 12a from the safety limit determining means 16 has been output, the dangerous operation number determining means 32 adds the number and sets it from 1 to 2,
A signal 32a for selecting the detailed message 18b is output to the first selecting means 24 ', and a detailed message is output from the voice generator 13b.

After that, even after the actuator is stopped by returning the operation lever to the neutral position and the operation to perform the operation on the dangerous side is repeated, only the number of times of the dangerous operation number discriminating means 32 is added, and the sound generator 13b is added. Will output a detailed message.

On the other hand, when the operating lever is operated in a direction away from the safety limit after the safety limit has been reached and the simplified message has been output, the safety limit cause determining means 30 'does not operate on the dangerous side, so the signal is output. 30b is not output. Therefore, the dangerous operation number discriminating means 32 outputs the signal 32a for selecting the simple message 18a to the first selecting means 24 'while the number of times remains set to 1 and the number of times remains set to 1, A simple message is output from the voice generator 13b. Further, when the telescopic boom 3 is separated from the safety limit by continuously operating the operation lever in a direction away from the safety limit, the signal 12a from the safety limit determination means 16 is not output, and a simple message is output from the sound generator 13b. At the same time, the number-of-risk-operations determination means 32 resets the number of times to zero. Thereafter, when the safety limit is reached again, the above operation is performed again.

As described above, the safety alarm device F outputs a simple message immediately after the safety limit is reached, and once the operation lever is returned to the neutral state but operates again in the direction toward the safety limit, a detailed message is output. Things. Once the operating lever is returned to neutral and then operated in a direction away from the safety limit, a simple message is output, and once the safety limit is not reached, no simple message is output. In this way, a simple message and a detailed message are automatically selected and output, so that the required minimum information can be transmitted to a skilled operator who can escape from the safety limit only with the simple message. In addition, sufficient information can be transmitted to an inexperienced operator who cannot immediately escape from the safety limit to perform an appropriate operation.

In the above embodiment, the telescopic boom 3 is determined to have reached the safety limit and an audio alarm is output. However, when the telescopic boom 3 has reached the danger zone where it has approached the safety limit by a predetermined amount or more. An audio warning may be output. Further, the safety alarm device applied to the aerial work vehicle has been described as an example, but it is needless to say that the present invention can also be applied to a work machine such as a mobile crane, an excavator and the like.

[0038]

According to the safety alarm device for a working machine of the present invention which is constructed and operates as described above, it is possible to transmit the minimum necessary information to the skilled operator by selecting the selecting means. It is possible to transmit sufficient information to the operator to perform an appropriate operation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a safety alarm device for a working machine according to the present invention, and is an explanatory diagram illustrating a first embodiment.

FIG. 2 is an explanatory view illustrating a safety alarm device for a work machine according to the present invention, and is an explanatory view illustrating a second embodiment.

FIG. 3 is an explanatory diagram illustrating an embodiment in which a safety alarm device for a working machine according to the present invention is developed.

FIG. 4 is an explanatory view illustrating an embodiment in which the safety alarm device for a working machine according to the present invention is developed.

FIG. 5 is an explanatory diagram illustrating an aerial work vehicle.

FIG. 6 is an explanatory view illustrating a conventional safety alarm device for a working machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 3 Telescopic boom 9 Switch (selection means) 11 Boom state detection means 12 Safety device 17 Voice alarm device 18a Simple message 18b Detailed message 20 Voice alarm device 21 Number discriminator (selection device) 23 Voice alarm device 23 'Voice alarm device 24 first selection means (selection means) 24 'first selection means (selection means) 25 second selection means (selection means) 28 safety device 31 safety device C safety alarm device D safety alarm device E safety alarm device F Safety alarm device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B66F 11/04 B66F 11/04

Claims (3)

[Claims] A work machine equipped with a telescopic boom that can be raised and lowered on a vehicle is provided with a boom state detecting means for detecting a state of the telescopic boom, and a state of the telescopic boom in response to a signal from the boom state detecting means. A safety alarm device for a working machine equipped with a safety device that determines that a dangerous area or a safety limit has been approached to a safety limit by a predetermined amount or more and outputs a signal, and a voice alarm device that receives the signal and issues an alarm by sound. In the above, the voice alarm device prepares at least a simple message and a detailed message as the content of the voice alarm, and is configured so that the content of the voice alarm can be selected by the selection means. Alarm device. 2. The safety alarm device for a working machine according to claim 1, wherein said selection means is configured to be able to select the content of an audio alarm by a switch. 3. The safety alarm device for a working machine according to claim 1, wherein said selection means is configured to select the content of an audio alarm according to the number of signals received from the safety device.